CN102489106B - Method for cycle collection of exhaust gas by adopting secondary adsorption - Google Patents
Method for cycle collection of exhaust gas by adopting secondary adsorption Download PDFInfo
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- CN102489106B CN102489106B CN 201110405574 CN201110405574A CN102489106B CN 102489106 B CN102489106 B CN 102489106B CN 201110405574 CN201110405574 CN 201110405574 CN 201110405574 A CN201110405574 A CN 201110405574A CN 102489106 B CN102489106 B CN 102489106B
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Abstract
The invention provides a method for closed loop recycling exhaust organic gas discharged by a plastic flexible package printing machine, a dry-laminating machine, an adhesive tape coating machine and other enclosure spaces by adopting activated carbon secondary adsorption. Through recycling of dry gas cleaned after exhaust organic gas recovery, the problems that water vapour in recovery gas is adsorbed by activated carbon, and the moisture content of solvent is too high because the adsorbed solvent is desorbed simultaneously when the water vapour is desorbed.
Description
Technical field
The present invention relates to a kind of gas circulation recovery method that adopts second adsorption, be particularly related to a kind of in airtight workshop or the plastic flexible package printing machine, dried answer a pager's call or the enclosure space of the equipment such as adhesive tape coating machine the organic exhaust gas that discharges, the gas circulation using method that adopts second adsorption to reclaim.
Background technology
In multiple industrial processes, such as the plastic flexible package printing, apply, spray paint, leather processing etc., all have the large flow organic exhaust gas discharging of a large amount of low concentrations, need to carry out recycling and administration to emission gases.
Traditional recovery process using activated carbon granule or the solvent in the carbon fiber adsorption and catalytic combustion organic exhaust gas adsorb and add thermal desorption by high-temperature steam after saturated, realize the recovery of solvent.This technological advantage is, technique is simple, and shortcoming is, produces in the desorption process to contain in a large number solvent waste water and needs to administer, owing to the high boiling solvent of the limited reason of vapor (steam) temperature can't reclaim by desorption.
Technological progress in recent years is mainly manifested on the desorption technology, and the thermal desorption cryogenic freezing that adds under the anti-flammability gas shield reclaims and the normal temperature recovery technology, has solved in the steam separating process process to contain in a large number the solvent wastewater problem because steam-condensation produces.Patent CN101637686; denomination of invention " a kind of method for organic waste gas recovery that adopts second adsorption "; disclose a kind of second thermal desorption normal temperature that adds that adsorbs under the anti-flammability gas shield that adopts and reclaimed technique; reduced the recovery energy consumption than prior art; improve the rate of recovery, realized recovery overall process qualified discharge.
But still there is following problems in the recovery technology that adds thermal desorption under adopting charcoal absorption, anti-flammability gas shield when processing the large flow organic exhaust gas of low concentration:
Adopt under charcoal absorption, the anti-flammability gas shield at the large flow organic exhaust gas of low concentration to add in the recovery technique of thermal desorption, because the steam that contains in the gas is by charcoal absorption, water and solvent are reclaimed in condenser simultaneously in removal process.Under southern hot and humid environment, produce simultaneously 150-200Kg when reclaiming 1 ton of solvent and contain solvent waste water especially.Adopt the steam desorption to produce a large amount of solvent condenses water problems that contain although new technique has solved, the recovery solvent that contains 15-20% moisture can not directly return in the typography and use.
For water-insoluble solvent, solvent needs processed, has increased cost recovery.For water-soluble solvent, recovered solvent and water are mixed, need rectifying and dewatering, and cost recovery is higher.
To such an extent as to how to reclaim the moisture that reduces in the technique in the elimination gas recovery at the organic exhaust gas that adopts the second absorption, it is the problem to be solved in the present invention.
Summary of the invention
The purpose of this invention is to provide a kind of employing second adsorption drying baker is carried out circulation recovery method with gas, by recycling the emission gases of adsorbing rear drying, solve steam and organic gas simultaneously absorption in absorber in the gas recovery, when desorption, the too high problem of recovery solvent comprises water rate that the while desorption causes.
The invention discloses a kind of employing the second absorption drying baker carried out circulation recovery method with gas, may further comprise the steps:
1) collects organic exhaust gas from waste gas enclosure space 7, organic exhaust gas is transported to gaseous effluent 9, and organic exhaust gas enters the first absorber 1 and adsorbs after gaseous effluent 9 coolings, gas after the adsorption dry returns waste gas enclosure space 7 and continues to recycle after waste gas filter 6 filters;
2) adopt anti-flammability gas that the first absorber 1 is carried out desorption, desorption gas that the first absorber desorption is gone out and that under normal temperature (room temperature) condensing condition, can't reclaim fully, enter the second absorber 2 and carry out the absorption second time, return the first absorber as recyclegas behind the gas-heated after the absorption, realize the complete desorption of the first absorber;
3) the second absorber carries out desorption, and the high concentration solvent gas that desorption goes out is realized solvent recovery in condenser 3.
Preferably, in step 1) waste gas adsorption cleaning process in, the first absorber air bleeding valve A, the second absorber air bleeding valve B and the first absorber intake valve D open, all the other valve closings; By waste gas enclosure space 7, waste gas circulation blower fan 8, gaseous effluent 9, the first absorber intake valve D, the first absorber 1, the first absorber air bleeding valve A, the second absorber air bleeding valve B, waste gas filter 6, waste gas enclosure space 7 forms waste gas adsorption cleaning treatment loop, contain organic waste gas (organic exhaust gas) and out pass through step 1 from waste gas enclosure space 7) return waste gas enclosure space 7 after removing organic matter, again supply with airtight workshop or plastic flexible package printing machine, dried answering a pager's call or the drying baker of adhesive tape coating machine (using as oven dry waste gas) realized recycling of oven dry waste gas.
Preferably, in step 2) the first absorber 1 desorption the time, the first absorber intake valve D, the first absorber air bleeding valve A and the second absorber air bleeding valve B close, and anti-flammability gas trap K and anti-flammability gas displacement air bleeding valve L open, and the air displacement in the first absorber 1 is become anti-flammability gas; Then the first desorption transfer valve C, the second desorption transfer valve F, the 3rd desorption transfer valve H and the 4th desorption transfer valve J open, all the other valve closings; Air-flow is successively through being made of the first absorber desorption the second absorber absorption loop the first absorber 1, the first desorption transfer valve C, condenser 3, the second desorption transfer valve F, the second absorber 2, the 3rd desorption transfer valve H, desorption blower fan 4, heater 5, the 4th desorption transfer valve J, the first absorber 1; Realize the first absorber 1 desorption, the high concentration absorption of the second absorber 2.
Preferably, in step 3) the second absorber 2 desorption the time, the 5th desorption transfer valve E, the 6th desorption transfer valve G, the 7th desorption transfer valve I open all the other valve closings; Air-flow is successively through forming the second absorber desorption solvent recovery loop by the second absorber 2, the 5th desorption transfer valve E, condenser 3, the 6th desorption transfer valve G, desorption blower fan 4, heater 5, the 7th desorption transfer valve I, the second absorber 2; Realize desorption and the solvent recovery of the second absorber 2.
Preferably, above-mentioned waste gas enclosure space 7 is drying baker or airtight workshop.
Preferably, with the wind regime of emission gases after reclaiming as plastic flexible package printing machine drying baker.
Preferably, with the wind regime of emission gases after reclaiming as plastic flexible package compounding machine drying baker.
Preferably, with the wind regime of emission gases after reclaiming as the drying baker of adhesive tape coating machine.
Preferably, emission gases after reclaiming is sent into airtight workshop, realize the gas circulation use.
Preferably, system also should be provided with the organic gas content detection of absorber exhaust, gas oxygen content detection and temperature detection and the corresponding control procedure of absorber desorption process.
Wherein the kind of adsorbent can adopt common adsorbent in the absorber, such as active carbon, zeolite, molecular sieve etc.
Recycling of absorber exhaust can have multiple implementation method in actual applications, when enclosure space 7 is drying baker:
In plastic flexible package presswork, emission gases after reclaiming is sent back to the air inlet of printing machine drying baker ventilating fan and realize recycling of oven dry gas;
Do in the multiple operation at plastic flexible package, emission gases after reclaiming is sent back to the air inlet of the dried drying baker ventilating fan of answering a pager's call and realize recycling of oven dry gas;
In adhesive tape coating production technology, emission gases after reclaiming is sent back to the air inlet of glue spreader drying baker ventilating fan and realize recycling of oven dry gas.
Needing many places wind regime or wind regime to put unfixed application for some can be with emission gases after reclaiming, and enclosure space 7 can be airtight workshop, sends into paint spray booth such as emission gases after will reclaiming in the production technology of spraying paint, and realizes the gas circulation use; Emission gases is sent into job shop after will reclaiming in leather processing technique, realizes the gas circulation use.
The present invention is recycling by the dry emission gases after organic exhaust gas is reclaimed, do not use the fresh air that contains steam, avoided the enrichment of steam at absorber, therefore, pass through said method, the invention solves steam and organic gas simultaneously absorption in active carbon in the gas recovery that enters active carbon adsorber, the too high problem of condensation recovered solvent moisture content.
Description of drawings
Fig. 1 is that waste gas circulation reclaims process principle figure;
Fig. 2 is waste gas circulation absorbing process flow process schematic drawing;
Technological process schematic drawing when Fig. 3 is the first absorber desorption, the absorption of the second absorber;
Fig. 4 is the second absorber desorption, solvent recovery process flow process schematic drawing;
In the accompanying drawing: 1 first absorber, 2 second absorbers, 3 condensers, 4 desorption blower fans, 5 heaters, 6 waste gas filters, 7 waste gas enclosure spaces, 8 waste gas circulation blower fans, 9 gaseous effluents, A the first absorber air bleeding valve, B the second absorber air bleeding valve, C the first desorption transfer valve, D the first absorber intake valve, E the 5th desorption transfer valve, F the second desorption transfer valve, G the 6th desorption transfer valve, H the 3rd desorption transfer valve, I the 7th desorption transfer valve, J the 4th desorption transfer valve, K anti-flammability gas trap, L anti-flammability gas displacement air bleeding valve.
The specific embodiment
Below in conjunction with accompanying drawing in addition specific embodiment the present invention is described in detail.
Embodiment 1
As shown in Figure 1, adsorbent equipment of the present invention comprises: the first absorber 1, the second absorber 2, condenser 3, desorption blower fan 4, heater 5, waste gas filter 6, enclosure space 7, waste gas circulation blower fan 8 and gaseous effluent 9, wherein, described enclosure space 7 can be drying baker or airtight workshop, in the summary of the invention of this specification, describe in detail, just no longer repeat, in the present embodiment, enclosure space 7 adopts drying baker.
Such as accompanying drawing 1, shown in Figure 2, in waste gas adsorption cleaning process, the first absorber air bleeding valve A, the second absorber air bleeding valve B, the first absorber intake valve D open all the other valve closings.Form waste gas adsorption cleaning treatment loop by drying baker 7, waste gas circulation blower fan 8, gaseous effluent 9, the first absorber intake valve D, the first absorber 1, the first absorber air bleeding valve A, the second absorber air bleeding valve B, waste gas filter 6, drying baker 7, explanation is herein, active carbon divides two-layerly up and down in the first absorber 1, and waste gas enters the middle part through valve D and enters filter 6 by valve A, lower floor by valve B by gas upper strata after the two-layer absorption up and down respectively.
Discharge organic exhaust gas in the drying baker 7 and extract out through waste gas circulation blower fan 8, after gaseous effluent 9 coolings, enter the first absorber 1 and adsorb, the gas after the adsorption dry returns in the drying baker 7 and recycles after waste gas filter 6 filters.Recycling of printing machine oven dry waste gas realized in this purified treatment loop.Because recyclegas does not exchange with extraneous air, steam a small amount of in the recyclegas is adsorbed by the first absorber, so that recyclegas becomes dry gas.Thereby solved the problem that the oven dry gases such as printing machine come from absorption large quantity of moisture in first absorber 1 that extraneous air causes.
Transfer the first absorber 1 desorption the second absorber 2 adsorption processes to after 1 absorption of the first absorber is saturated, the first absorber intake valve D, the first absorber air bleeding valve A and the second absorber air bleeding valve B close.Anti-flammability gas trap K and anti-flammability gas displacement air bleeding valve L open, and the air displacement in the first absorber 1 is become anti-flammability gas.The first desorption transfer valve C, the second desorption transfer valve F, the 3rd desorption transfer valve H, the 4th desorption transfer valve J opened all the other valve closings after gas displacement was finished.Form the first desorption the second absorption loop, as shown in Figure 3 (parts that wherein do not work in the accompanying drawing 1 are omitted at this) by the first absorber 1, the first desorption transfer valve C, condenser 3, the second desorption transfer valve F, the second absorber 2, the 3rd desorption transfer valve H, desorption blower fan 4, heater 5, the 4th desorption transfer valve J, the first absorber 1 in this process.The desorption gas that the first absorber 1 is discharged is after condenser 3 coolings, entering the second absorber 2 adsorbs again, after 4 pressurizations of desorption blower fan, heater 5 heat up, return the first absorber 1 is finished desorption and second absorber 2 of the first absorber 1 as the circulation desorption gas high concentration absorption by the Exhaust Gas after 2 absorption of the second absorber.
Transfer the second absorber 2 desorption processes to after finishing the absorption of the first absorber 1 desorption and the second absorber 2 high concentrations, the 5th desorption transfer valve E, the 6th desorption transfer valve G, the 7th desorption transfer valve I open all the other valve closings.Form the second absorber desorption solvent recovery loop, as shown in Figure 4 (parts that wherein do not work in the accompanying drawing 1 are omitted) by the second absorber 2, the 5th desorption transfer valve E, condenser 3, the 6th desorption transfer valve G, desorption blower fan 4, heater 5, the 7th desorption transfer valve I, the second absorber 2 in this process.The high concentration desorption gas that the second absorber 2 is discharged reclaims in condenser 3 liquefaction, and gas returns the second absorber 2 is finished the second absorber 2 as the circulation desorption gas desorption after reclaiming after 4 pressurizations of desorption blower fan, heater 5 heat up.This desorption process is realized desorption and the solvent recovery of the second absorber 2.
In painting process, its schematic structure is all identical with the accompanying drawing 1 to Fig. 4 of embodiment 1, the only different differences of selecting that are enclosure space 7, wherein, enclosure space 7 is airtight workshop, and in painting process, airtight workshop is exactly paint spray booth, emission gases is sent into paint spray booth after will reclaiming, and realizes the gas circulation use;
In leather processing procedure, its schematic structure is all identical with the accompanying drawing 1 to Fig. 4 of embodiment 1, the only different differences of selecting that are enclosure space 7, wherein, enclosure space 7 is airtight workshop, and in leather processing procedure, airtight workshop is exactly the leather processing workshop, emission gases is sent into the leather processing workshop after will reclaiming, and realizes the gas circulation use;
Above explanation is just illustrative for the purpose of the present invention; and nonrestrictive, those of ordinary skills understand, in the situation that does not break away from the spirit and scope that claim limits; can make many modifications, variation or equivalence, but all will fall within protection scope of the present invention.
Claims (8)
1. one kind is adopted second adsorption to the method that waste gas circulates and reclaims, and it is characterized in that, it may further comprise the steps:
1), collects organic exhaust gas from waste gas enclosure space (7), organic exhaust gas is transported to gaseous effluent (9), organic exhaust gas is after gaseous effluent (9) cooling, entering the first absorber (1) adsorbs, gas after the adsorption dry returns waste gas enclosure space (7) and continues to recycle after waste gas filter (6) filters;
2), adopt anti-flammability gas that the first absorber (1) is carried out desorption, with the first absorber desorption desorption gas that go out and that under the normal temperature condensing condition, can't reclaim fully, enter the second absorber (2) and carry out the absorption second time, return the first absorber (1) as recyclegas behind the gas-heated after the absorption, realize the complete desorption of the first absorber;
3), the second absorber carries out desorption, the high concentration solvent gas that desorption goes out is realized solvent recovery in condenser (3);
Wherein, in step 2) the first absorber (1) desorption the time, the first absorber intake valve (D), the first absorber air bleeding valve (A) and the second absorber air bleeding valve (B) are closed, anti-flammability gas trap (K) and anti-flammability gas displacement air bleeding valve (L) are opened, and the air displacement in the first absorber (1) is become anti-flammability gas; Then the first desorption transfer valve (C), the second desorption transfer valve (F), the 3rd desorption transfer valve (H) and the 4th desorption transfer valve (J) are opened, all the other valve closings; Form the first absorber desorption the second absorber absorption loop by the first absorber (1), the first desorption transfer valve (C), condenser (3), the second desorption transfer valve (F), the second absorber (2), the 3rd desorption transfer valve (H), desorption blower fan (4), heater (5), the 4th desorption transfer valve (J), the first absorber (1); Realize the first absorber (1) desorption and solvent recovery, and the absorption of the high concentration of the second absorber (2).
2. the method for claim 1, it is characterized in that: in step 1) waste gas adsorption cleaning process in, the first absorber air bleeding valve (A), the second absorber air bleeding valve (B) and the first absorber intake valve (D) are opened, all the other valve closings; Form waste gas adsorption cleaning treatment loop by enclosure space (7), waste gas circulation blower fan (8), gaseous effluent (9), the first absorber intake valve (D), the first absorber (1), the first absorber air bleeding valve (A), the second absorber air bleeding valve (B), waste gas filter (6), enclosure space (7), realize recycling of oven dry waste gas.
3. method as claimed in claim 1 or 2, it is characterized in that: in step 3) the second absorber (2) desorption the time, the 5th desorption transfer valve (E), the 6th desorption transfer valve (G), the 7th desorption transfer valve (I) are opened all the other valve closings; Form the second absorber desorption and solvent recovery loop by the second absorber (2), the 5th desorption transfer valve (E), condenser (3), the 6th desorption transfer valve (G), desorption blower fan (4), heater (5), the 7th desorption transfer valve (I), the second absorber (2); Realize desorption and the solvent recovery of the second absorber (2).
4. method as claimed in claim 1 or 2, it is characterized in that: described enclosure space (7) is drying baker or airtight workshop.
5. method as claimed in claim 4 is characterized in that: with step 1) in gas after waste gas filter (6) filters as the wind regime of plastic flexible package printing machine drying baker, realize that gas circulation uses.
6. method as claimed in claim 4 is characterized in that: with step 1) in gas after waste gas filter (6) filters as the wind regime of plastic flexible package compounding machine drying baker, realize that gas circulation uses.
7. method as claimed in claim 4 is characterized in that: with step 1) in gas after waste gas filter (6) filters as the wind regime of the drying baker of adhesive tape coating machine, realize that gas circulation uses.
8. method as claimed in claim 4 is characterized in that: with step 1) in gas after waste gas filter (6) filters send into airtight job shop, realize that gas circulation uses.
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| CN105536429B (en) * | 2015-12-11 | 2018-05-11 | 凯天环保科技股份有限公司 | Exhaust gas absorbing treatment device and processing method |
| CN108144409A (en) * | 2017-05-26 | 2018-06-12 | 广州市帝东环保科技有限公司 | A kind of solvent recovering system avoids the desorption mechanism and its desorption method of secondary pollution |
| CN108079766A (en) * | 2018-01-30 | 2018-05-29 | 洛阳天宝环保科技有限公司 | A kind of low concentration big flow organic exhaust gas closed loop multistage retracting device and recovery method |
| CN109173568B (en) * | 2018-09-26 | 2020-11-27 | 南京兆博环保科技有限公司 | Active carbon level difference adsorption safe concentration method |
| CN109731433B (en) * | 2018-12-18 | 2021-12-10 | 杭州捷瑞空气处理设备有限公司 | Ethyl acetate recovery method combining activated carbon adsorption and rotary wheel adsorption |
| CN109985485B (en) * | 2019-04-29 | 2021-06-22 | 南京兆博环保科技有限公司 | Device and method for adsorbing, recovering and purifying high-concentration gas |
| CN110327738A (en) * | 2019-07-29 | 2019-10-15 | 中科新天地（合肥）环保科技有限公司 | Zeolite runner Adsorption Concentration RTO cooperating with low-temperature plasma waste gas treatment process |
| CN110898556B (en) * | 2019-12-20 | 2021-08-03 | 华电阜康发电有限公司 | A exhaust treatment device for power plant |
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| CN101045190A (en) * | 2007-04-28 | 2007-10-03 | 武汉旭日华科技发展有限公司 | Method for recovering organic waste gas during printing or coating production |
| CN101637686A (en) * | 2009-09-07 | 2010-02-03 | 孙宗长 | Method for organic waste gas recovery by adopting secondary adsorption |
| CN102029148A (en) * | 2010-11-23 | 2011-04-27 | 张家港市三星净化设备制造有限公司 | Dry method desorption device for organic waste gas activated carbon adsorption |
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| EP0904823A2 (en) * | 1997-09-30 | 1999-03-31 | The Boc Group, Inc. | Gas purification method |
| CN101045190A (en) * | 2007-04-28 | 2007-10-03 | 武汉旭日华科技发展有限公司 | Method for recovering organic waste gas during printing or coating production |
| CN101637686A (en) * | 2009-09-07 | 2010-02-03 | 孙宗长 | Method for organic waste gas recovery by adopting secondary adsorption |
| CN102029148A (en) * | 2010-11-23 | 2011-04-27 | 张家港市三星净化设备制造有限公司 | Dry method desorption device for organic waste gas activated carbon adsorption |
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